Posion!

Roselia (Lm) for the rest of this format. Next year, then I have no idea. Possibly a random Vileplume (Hp) teched into decks, but even then, that's quite bad.
 
Venusaur's (EX Crystal Guardians 28/100) Toxic Sleep imo.
Hey, what about burn?:p
 
Just poison in general, Crobat HL was incrediably powerful. Triple poison, does 3 dmage counters a turn.

Arbok δ, Cacturne PK, Beedrill δ, Cradily PK, Weezing DX, Roselia LM, Vileplume δ are all very useful in certain situations.
 
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